MBT8301 Technical Reference
Trenton Systems, Inc.
11
BIOS Status POST Code LEDs
As the POST (Power On Self Test) routines are performed during boot-up, test codes are displayed on Port 80 POST
code LEDs 0, 1, 2, 3, 4, 5, 6 and 7. These LED are located on the top of the CARD, just above the board’s battery
socket. The POST Code LEDs and are numbered from right (position 1 = LED0) to left (position 8 – LED7).
The POST code checkpoints are the largest set of checkpoints during the BIOS pre-boot process. The following
chart is a key to interpreting the POST codes displayed on LEDs 0 through 7 on the MBC8240 card. Refer to the
board layout in the
Specifications
chapter for the exact location of the POST code LEDs.
Upper Nibble (UN)
Lower Nibble (LN)
Hex.
Value
LED7
LED6
LED5
LED4
Hex.
Value
LED3
LED2
LED1
LED0
0
Off
Off
Off
Off
0
Off
Off
Off
Off
1
Off
Off
Off
On
1
Off
Off
Off
On
2
Off
Off
On
Off
2
Off
Off
On
Off
3
Off
Off
On
On
3
Off
Off
On
On
4
Off
On
Off
Off
4
Off
On
Off
Off
5
Off
On
Off
On
5
Off
On
Off
On
6
Off
On
On
Off
6
Off
On
On
Off
7
Off
On
On
On
7
Off
On
On
On
8
On
Off
Off
Off
8
On
Off
Off
Off
9
On
Off
Off
On
9
On
Off
Off
On
A
On
Off
On
Off
A
On
Off
On
Off
B
On
Off
On
On
B
On
Off
On
On
C
On
On
Off
Off
C
On
On
Off
Off
D
On
On
Off
On
D
On
On
Off
On
E
On
On
On
Off
E
On
On
On
Off
F
On
On
On
On
F
On
On
On
On
Lower
Nibble
7 6 5 4 3 2 1 0
Upper
Nibble
MBC8240 POST Code LEDs
Summary of Contents for MBT8301 Series
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